Jaggies on AF100 Progressive footage (AF100 Progressive workflow?)

G

Grant Fergus

Member
Hi guys,

I just wanted to discuss an issue that I have come across recently involving Jaggies around the fringes of people on my interview.
I also wanted to use this thread to clarify the workflow for progressive footage shot using AF100.

Note: The 'Jaggies'/ interlaced style artifacts are not present in the original footage.

The footage shot is on a greenscreen and a basic 4 person with an interviewer setup.

These are some of camera settings I used:

CAM SETTINGS INFO (AF100)

SCENE SELECT F6

OPERATION: FILM CAM



REC FORMAT: PH 1080/25P

VFR MODE OFF

DETAIL LEVEL 0
V DETAIL LEVEL 0


DETAIL CORING 0
CHROMA LEVEL 0
CHROMA PHASE 0
COLOR TEMP Ach 0
COLOR TEMP Bch 0
MASTER PED 0
A. IRIS LEVEL 0
DRS OFF


GAMMA HD NORM
KNEE: AUTO

MATRIX NORM 2
SKIN TONE DTL OFF

Note: Original footage doesn't have the artifacts/Jaggy issue. It's a multicam shoot where I had to use a wide camera shooting 1080i
coupled with my AF100 shooting progressive for the closeups. It's my understanding that the progressive footage uses an interlaced
stream to store the image, so I just wanted to A) ask about why Jaggies might be showing up and B) Clarify a few things about the AF100
Progressive footage workflow.

1) Am I right to be editing all my AF100 progressive footage in an interlaced timeline?
2) How does that work in terms of upper field first lower field first etc?
3) Do I export interlaced or progressive?

Note: I've had some good results exporting TGA sequences with progressive checked but still not entirely sure what the correct workflow from import to export would be.

Here are the project/sequence settings I'm using where unpleasant Jaggies are showing up around the edges of the people/faces:

AVCHD 1080i square pixel.
25 fps
1920x1080 16:9
PAR 1.0
Fields Upper First.

Preview File Format: I-frame Only Mpeg

Cheers guys,

thanks in advance for any input,

Grant :)
 
Progressive should be edited with no frame order. Or none. When I get graphics that are upper or lower I get the jaggies. I just change the field order on the graphic to none in Final Cut
 
Grant Fergus said:
REC FORMAT: PH 1080/25P

AVCHD 1080i square pixel.
Click to expand...

I believe your issue is here. Can you set up your NLE (you didn't specify which one you used) to use the 1080 25P footage? Right now you are telling it to interpret the footage at 50 fields per second, or 25 fps interlaced.
 
Thanks JPM, I'm using Premiere CS4 but the whole issue of interlaced/progressive when working with AF100 progressive footage is exactly what I'm trying to work out. I've found some info in the AF100 book that might help clarify my query:

P111 THE AF100 BOOK (Barry Green)

"In addition to interlaced mode, you also have the option of recording progressive-scan footage in 1080 PH mode using the 24/30P or (for 50Hz users) 25P modes. In these modes, the image is scanned progressively, and (in 1080/24P mode) recorded as a native progressive data stream, but 25P/30P technically get recorded within an interlaced data stream; 25P is recorded within a 50i data stream, and 30P is recorded within a 60i data stream. Each frame is captured distinctly, and then divided into fields for purposes of recording in the chosen format.

Flags are set in the data stream that tell non-linear-editing programs that these pairs of fields should actually instead be treated as progressive frames, and nonlinear editing programs know how to reassemble the fields back into their original full progressive frames. There's no synthesizing or frame blending; instead it's a simple task of "use this field and that field, snap them back together and the results are treated as a full progressive frame."

The footage is pure progressive, but think of it as progressive footage that has been carried in an "interlaced basket" - it's progressive when you put it in there, and it'll be progressive when you take it out (i.e) when you edit it). "
-----------------------------------------------------------

So this is where the confusion was for me, reading that section of the book would suggest I edit it in a progressive sequence in my NLE,
but I'm just looking for a conclusive answer on how to setup my timeline as other people have been confused by this matter as this thread shows:

http://www.dvxuser.com/V6/showthrea...0-material-progressive-shown-as-interlaced-!-!

thanks,
Grant
 
You should never edit progressive footage on an interlaced timeline unless you have to. You should also never export/render to an interlaced format unless you have to.

Avoid anything interlaced in your workflow at any step along the way, and if you have to deliver as interlaced, then only do it as your very last step.
 
David Jimerson said:
You should never edit progressive footage on an interlaced timeline unless you have to. You should also never export/render to an interlaced format unless you have to.

Avoid anything interlaced in your workflow at any step along the way, and if you have to deliver as interlaced, then only do it as your very last step.
Click to expand...

Thanks David, just to clarify:

25P/30P technically get recorded within an interlaced data stream; 25P is recorded within a 50i data stream,

Are you saying that although the AF100 progressive footage is recorded within an interlaced data stream I should treat the AF100 progressive footage
like any other progressive footage and just setup a progressive workflow?

thanks,
Grant
 
Sorry I meant to ask as well, what would be the solution to choosing to edit on an interlaced timeline when it should have been progressive?

Could I create a progressive sequence and drag the interlaced on into the progressive one, or is there a better solution?

(I'm using Premiere CS4)

Thanks,
Grant
 
Grant Fergus said:
Thanks David, just to clarify:

25P/30P technically get recorded within an interlaced data stream; 25P is recorded within a 50i data stream,

Are you saying that although the AF100 progressive footage is recorded within an interlaced data stream I should treat the AF100 progressive footage
like any other progressive footage and just setup a progressive workflow?
Click to expand...

Yes -- though PP CS4 has no 30p preset; you'll have to set that up manually. It will, however, detect that it's progressive, and not interlaced, footage.
 
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